I'm trying to install ANTS 5 on Windows 7 x64 but the Microsoft Visual J# Runtime 2 Redistributable Package fails on install, though according to Microsoft it should run fine even though it's a 32bit only package.

I had the same issue with installing on Windows 7 x64. We have a MSDN license at work and I was able to install the Visual J# runtime separately. not sure if it will work on your problem or if you have access to the msdn copy of the j#, but it did work for our environment here at work.